annotate test/testdraw2.c @ 5162:df758fce08e9

Create the video texture based on the available texture formats, not the backbuffer format.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 03 Feb 2011 01:13:48 -0800
parents ad50b3db78bd
children d976b67150c5
rev   line source
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1
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2 /* Simple program: draw as many random objects on the screen as possible */
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3
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4 #include <stdlib.h>
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5 #include <stdio.h>
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6 #include <time.h>
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7
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8 #include "common.h"
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9
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10 #define NUM_OBJECTS 100
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11
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12 static CommonState *state;
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13 static int num_objects;
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14 static SDL_bool cycle_color;
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15 static SDL_bool cycle_alpha;
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16 static int cycle_direction = 1;
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17 static int current_alpha = 255;
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18 static int current_color = 255;
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19 static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
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20
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21 void
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22 DrawPoints(SDL_Window * window, SDL_Renderer * renderer)
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23 {
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24 int i;
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25 int x, y;
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26 int window_w, window_h;
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27
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28 /* Query the sizes */
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29 SDL_GetWindowSize(window, &window_w, &window_h);
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30
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31 for (i = 0; i < num_objects * 4; ++i) {
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32 /* Cycle the color and alpha, if desired */
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33 if (cycle_color) {
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34 current_color += cycle_direction;
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35 if (current_color < 0) {
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36 current_color = 0;
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37 cycle_direction = -cycle_direction;
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38 }
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39 if (current_color > 255) {
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40 current_color = 255;
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41 cycle_direction = -cycle_direction;
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42 }
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43 }
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44 if (cycle_alpha) {
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45 current_alpha += cycle_direction;
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46 if (current_alpha < 0) {
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47 current_alpha = 0;
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48 cycle_direction = -cycle_direction;
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49 }
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50 if (current_alpha > 255) {
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51 current_alpha = 255;
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52 cycle_direction = -cycle_direction;
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53 }
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54 }
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55 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
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56 (Uint8) current_color, (Uint8) current_alpha);
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57
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58 x = rand() % window_w;
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59 y = rand() % window_h;
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60 SDL_RenderDrawPoint(renderer, x, y);
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61 }
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62 }
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63
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64 void
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65 DrawLines(SDL_Window * window, SDL_Renderer * renderer)
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66 {
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67 int i;
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68 int x1, y1, x2, y2;
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69 int window_w, window_h;
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70
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71 /* Query the sizes */
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72 SDL_GetWindowSize(window, &window_w, &window_h);
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73
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74 for (i = 0; i < num_objects; ++i) {
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75 /* Cycle the color and alpha, if desired */
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76 if (cycle_color) {
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77 current_color += cycle_direction;
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78 if (current_color < 0) {
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79 current_color = 0;
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80 cycle_direction = -cycle_direction;
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81 }
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82 if (current_color > 255) {
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83 current_color = 255;
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84 cycle_direction = -cycle_direction;
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85 }
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86 }
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87 if (cycle_alpha) {
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88 current_alpha += cycle_direction;
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89 if (current_alpha < 0) {
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90 current_alpha = 0;
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91 cycle_direction = -cycle_direction;
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92 }
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93 if (current_alpha > 255) {
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94 current_alpha = 255;
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95 cycle_direction = -cycle_direction;
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96 }
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97 }
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98 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
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99 (Uint8) current_color, (Uint8) current_alpha);
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100
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101 if (i == 0) {
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102 SDL_RenderDrawLine(renderer, 0, 0, window_w - 1, window_h - 1);
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103 SDL_RenderDrawLine(renderer, 0, window_h - 1, window_w - 1, 0);
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104 SDL_RenderDrawLine(renderer, 0, window_h / 2, window_w - 1, window_h / 2);
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105 SDL_RenderDrawLine(renderer, window_w / 2, 0, window_w / 2, window_h - 1);
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106 } else {
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107 x1 = (rand() % (window_w*2)) - window_w;
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108 x2 = (rand() % (window_w*2)) - window_w;
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109 y1 = (rand() % (window_h*2)) - window_h;
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110 y2 = (rand() % (window_h*2)) - window_h;
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111 SDL_RenderDrawLine(renderer, x1, y1, x2, y2);
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112 }
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113 }
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114 }
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115
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116 void
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117 DrawRects(SDL_Window * window, SDL_Renderer * renderer)
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118 {
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119 int i;
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120 SDL_Rect rect;
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121 int window_w, window_h;
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122
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123 /* Query the sizes */
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124 SDL_GetWindowSize(window, &window_w, &window_h);
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125
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126 for (i = 0; i < num_objects / 4; ++i) {
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127 /* Cycle the color and alpha, if desired */
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128 if (cycle_color) {
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129 current_color += cycle_direction;
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130 if (current_color < 0) {
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131 current_color = 0;
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132 cycle_direction = -cycle_direction;
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133 }
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134 if (current_color > 255) {
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135 current_color = 255;
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136 cycle_direction = -cycle_direction;
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137 }
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138 }
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139 if (cycle_alpha) {
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140 current_alpha += cycle_direction;
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141 if (current_alpha < 0) {
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142 current_alpha = 0;
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143 cycle_direction = -cycle_direction;
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144 }
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145 if (current_alpha > 255) {
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146 current_alpha = 255;
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147 cycle_direction = -cycle_direction;
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148 }
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149 }
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150 SDL_SetRenderDrawColor(renderer, 255, (Uint8) current_color,
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151 (Uint8) current_color, (Uint8) current_alpha);
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152
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153 rect.w = rand() % (window_h / 2);
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154 rect.h = rand() % (window_h / 2);
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155 rect.x = (rand() % (window_w*2) - window_w) - (rect.w / 2);
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156 rect.y = (rand() % (window_h*2) - window_h) - (rect.h / 2);
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157 SDL_RenderFillRect(renderer, &rect);
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158 }
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159 }
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160
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161 int
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162 main(int argc, char *argv[])
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163 {
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164 int i, done;
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165 SDL_Event event;
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166 Uint32 then, now, frames;
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167
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168 /* Initialize parameters */
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169 num_objects = NUM_OBJECTS;
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170
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171 /* Initialize test framework */
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172 state = CommonCreateState(argv, SDL_INIT_VIDEO);
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173 if (!state) {
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174 return 1;
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175 }
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176 for (i = 1; i < argc;) {
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177 int consumed;
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178
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179 consumed = CommonArg(state, i);
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180 if (consumed == 0) {
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181 consumed = -1;
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182 if (SDL_strcasecmp(argv[i], "--blend") == 0) {
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183 if (argv[i + 1]) {
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184 if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
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185 blendMode = SDL_BLENDMODE_NONE;
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186 consumed = 2;
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187 } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
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188 blendMode = SDL_BLENDMODE_BLEND;
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189 consumed = 2;
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190 } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
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191 blendMode = SDL_BLENDMODE_ADD;
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192 consumed = 2;
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193 }
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194 }
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195 } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
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196 cycle_color = SDL_TRUE;
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197 consumed = 1;
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198 } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
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199 cycle_alpha = SDL_TRUE;
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200 consumed = 1;
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201 } else if (SDL_isdigit(*argv[i])) {
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202 num_objects = SDL_atoi(argv[i]);
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203 consumed = 1;
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204 }
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205 }
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206 if (consumed < 0) {
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207 fprintf(stderr,
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208 "Usage: %s %s [--blend none|blend|add] [--cyclecolor] [--cyclealpha]\n",
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209 argv[0], CommonUsage(state));
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210 return 1;
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211 }
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212 i += consumed;
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213 }
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214 if (!CommonInit(state)) {
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215 return 2;
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216 }
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217
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218 /* Create the windows and initialize the renderers */
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219 for (i = 0; i < state->num_windows; ++i) {
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220 SDL_Renderer *renderer = state->renderers[i];
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221 SDL_SetRenderDrawBlendMode(renderer, blendMode);
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222 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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223 SDL_RenderClear(renderer);
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224 }
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225
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226 srand((unsigned int)time(NULL));
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227
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228 /* Main render loop */
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229 frames = 0;
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230 then = SDL_GetTicks();
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231 done = 0;
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232 while (!done) {
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233 /* Check for events */
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234 ++frames;
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235 while (SDL_PollEvent(&event)) {
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236 CommonEvent(state, &event, &done);
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237 }
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238 for (i = 0; i < state->num_windows; ++i) {
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239 SDL_Renderer *renderer = state->renderers[i];
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240 SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF);
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241 SDL_RenderClear(renderer);
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242
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243 DrawRects(state->windows[i], renderer);
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244 DrawLines(state->windows[i], renderer);
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245 DrawPoints(state->windows[i], renderer);
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246
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247 SDL_RenderPresent(renderer);
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248 }
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249 }
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250
3371
438ba87e9578 Call CommonQuit() at exit has been added.
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251 CommonQuit(state);
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252
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253 /* Print out some timing information */
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254 now = SDL_GetTicks();
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255 if (now > then) {
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256 double fps = ((double) frames * 1000) / (now - then);
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257 printf("%2.2f frames per second\n", fps);
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258 }
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259 return 0;
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260 }
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261
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262 /* vi: set ts=4 sw=4 expandtab: */